Stool



FIG. 1 is a perspective view of a stool, showing my new design;

FIG. 2 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines showing text and foot rest apertures in the figures depict environmental matter and form no part of the claimed design. 

I claim the ornamental design for a stool, as shown and described. 